ADIPOQ and type 2 diabetes mellitus: -G allele associated with higher IGT risk (OR = 1.65, 95% CI 1.08–2.51, p = 0.020); no association with T2DM, no association with BMI, WC, WHR, fasting glucose, fasting insulin, HOMA-IR, HDL-C, TG, or serum adiponectin